Chelsea's replay against Brentford will be played on the same weekend as the fifth-round matches on Feb. 16-17 since the next three midweeks are filled with fixtures in the Premier League, international football and the Europa League.
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Tencho Hristov ignored warnings and got trapped between barriers at Roydon in Essex.
The 6km bike track will include 130m of the South Circular near Kew Bridge.
The unfortunate officer was taken to a central London hospital for treatment and his condition is not life-threatening.